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Lens barrel and imaging optical system




Title: Lens barrel and imaging optical system.
Abstract: A lens barrel of the present invention is provided with an electric section having a plurality of sliding portions that slide along the predetermined conductor pattern. The electric section is provided with a thin-sheet electric section body supporting the plurality of sliding portions, and a reinforcing portion is provided at the electric section body. Therefore, in the lens barrel 1, the reinforcing portion increases the deformation resistance of the electric section body that supports the sliding portions. ...


USPTO Applicaton #: #20120307385
Inventors: Yoshifumi Mitani


The Patent Description & Claims data below is from USPTO Patent Application 20120307385, Lens barrel and imaging optical system.

BACKGROUND

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OF THE INVENTION

1. Field of the Invention

The present invention relates to a lens barrel of a camera or the like and an imaging optical system provided with such lens barrel.

2. Background Art

Lens barrels, for example, of cameras are often provided with a position detection device for performing position control of a movable lens group. For example, when a movable lens group is moved with respect to a fixed tube by drive operating an annular lens engagement member that is engaged with the movable lens group, the lens drive position is detected by detecting the relative positions of the lens engagement member and the fixed tube. The technique for performing such position detection is disclosed, for example, in Japanese Patent Application Publication No. 2007-17679. An encoder device disclosed in Japanese Patent Application Publication No. 2007-17679 is provided with an electric section body in the form of a thin sheet and a plurality of sliding pieces having a sliding portion at the distal end and supported in the arranged state at the electric section body which constitutes an electric section (zoom brush). In the encoder device, the electric section body is screwed to an annular lens engagement member (zoom operation ring) and the movable lens group moves in the optical axis direction following the rotation of the lens engagement member. The sliding portion slides along the conductor pattern of the flexible printed board that is held at the fixed tube (fixed portion) and has the conductor pattern. Further, in the encoder device, the relative positions of the lens engagement member and the fixed tube are detected by detecting the combination of conductive states of the conductor pattern and the sliding portion.

However, in the encoder device described in Japanese Patent Application Publication No. 2007-17679, for example, when the thin-sheet electric section body is screwed to the lens engagement member, the electric section body is sometimes deflected in the arrangement direction of the sliding portions. Where such deformation occurs, the sliding portion can come into contact with the adjacent line of the conductor pattern when sliding along the conductor pattern.

Further, since the electric section is screwed to the lens engagement member, the lens engagement member is required to be thick enough so that the threaded hole for the screw could be formed therein and the space for arranging the screw is required. For this reason, the dimension of the lens engagement member in the diametrical direction increases and the lens engagement member is difficult to miniaturize. Furthermore, when the electric section is screwed to the lens engagement member, the position of the electric section with respect to the conductor pattern is difficult to adjust. For example, where the lens engagement member is displaced with respect to the fixed tube or an error has occurred in the production of the printed board, the electric section is difficult to set at the predetermined position with respect to the printed board.

SUMMARY

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OF THE INVENTION

The present invention has been created with consideration for the above-described problems and it is an object thereof to provide a lens barrel equipped with an electric section in which an electric section body that supports sliding portions is made resistant to deformation and also to provide an imaging optical system using the lens barrel.

The lens barrel and imaging optical system in accordance with the present invention are provided with an electric section having a plurality of sliding portions that slide along a predetermined conductor pattern, the electric section is provided with a thin-sheet electric section body that supports the plurality of sliding portions, and a reinforcing section is provided at the electric section body. Therefore, in such lens barrel and imaging optical system, the reinforcing portion increases the deformation resistance of the electric section body that supports the sliding portions.

These and other objects, features and advantages of the present invention will become more apparent upon reading the following detailed description along with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

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FIG. 1 is an exploded perspective drawing of the principal portion of the lens barrel in an embodiment;

FIG. 2 is a half-sectional view of the imaging optical system provided with the lens barrel of the embodiment;

FIG. 3 is an enlarged plane view of the electric section used in the lens barrel and imaging optical system shown in FIGS. 1 and 2;

FIG. 4 is an enlarged plan view of the principal portion of the lens barrel;

FIG. 5 is a cross-sectional view along the V-V section in FIG. 4;

FIG. 6 is a cross-sectional view along the VI-VI section in FIG. 4;

FIG. 7 is an enlarged explanatory drawing of the principal portion of the lens barrel using the electric section of another embodiment;

FIG. 8 is a cross-sectional view along the VIII-VIII section in FIG. 7; and

FIG. 9 is a half-sectional view of the imaging optical system provided with the lens barrel of the other embodiment.

DETAILED DESCRIPTION

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OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will be described hereinbelow with reference to the accompanying drawings. The components assigned with like reference numerals in the drawings are like components and the redundant explanation thereof is omitted.

FIG. 1 is an exploded perspective drawing of the principal portion of the lens barrel in one embodiment. FIG. 2 is a half-sectional view of the imaging optical system provided with the lens barrel in FIG. 1. FIG. 3 is an enlarged plane view of the electric section. The explanation below is conducted by taking the X direction shown in FIGS. 1 and 2 as the direction forward (object side) and Y direction as the direction rearward (image side). FIG. 4 is an enlarged plan view of the principal portion of the lens barrel shown in FIGS. 1 and 2. FIG. 5 is a cross-sectional view along the V-V section in FIG. 4. FIG. 6 is a cross-sectional view along the VI-VI section in FIG. 4.

As shown in FIG. 2, an imaging optical system of the embodiment is provided with a lens barrel 1 and lens groups 31, 32 accommodated in the lens barrel 1 as shown in FIG. 2.

As shown in FIGS. 1 and 2, the lens barrel 1 is provided with a barrel body 10 and an electric section 5 attached to the barrel body 10. The barrel body 10 is provided with a cylindrical fixed tube 2 and drive members 40, 41 that drive the lens group 31. The drive members 40, 41 are rotatably held at the fixed tube 2. The drive members 40, 41 may be configured to enable translatory motion.

A printed board 8 is held at the outer circumference of the fixed tube 2 by attaching with fixing means such as an adhesive.

The printed board 8 is a constitution member of a position detection device and constitutes the position detection device that detects the position of the lens group 31 relative to the fixed tube 2 with the electric section 5 and the like. In the present embodiment, the printed board 8 is, for example, a flexible printed board. The printed board 8 may be also a rigid board. In such case, the drive members 40, 41 preferably perform translatory motion. As shown in FIG. 4, the printed board 8 is provided with a conductor pattern 81.

The conductor pattern 81 of the present embodiment is provided with a plurality of conductive portions 82 formed so as to extend in a longitudinal direction with a predetermined spacing in a width direction and non-conductive portions 83 formed between the conductive portions 82 adjacent in the width direction. In FIG. 4, the width direction is the XY direction which is along the axial direction of the fixed tube 2, and the longitudinal direction is perpendicular to the width direction.

The conductor pattern 81 of the printed board 8 configured in the above-described manner is attached with an adhesive to the outer circumferential surface of the fixed tube 2 so that the longitudinal direction extends in the circumferential direction of the fixed tube 2, and the conductive portions 82 are connected by an electric wire (not shown in the figure) to a control unit (not shown in the figure) provided at the fixed tube 2.

Returning to FIGS. 1 and 2, in the fixed tube 2, a mount member 22 is fixedly attached to the rear end side (Y direction in FIG. 2) of the fixed tube 2, with an outer tube 21 being interposed therebetween. The barrel body 10 is mounted on a camera body (not shown in the figures) by connecting the mount member 22 to the camera body.

In the present embodiment, as shown in FIG. 2, an optical system that forms an optical image of an object (imaging object) is provided with the movable lens group 31 that moves relative to the fixed tube 2 and the fixed lens group 32 that does not move relative to the fixed tube 2. Thus, the optical system of the present embodiment is of a front lens fixed type.




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stats Patent Info
Application #
US 20120307385 A1
Publish Date
12/06/2012
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0




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20121206|20120307385|lens barrel and imaging optical system|A lens barrel of the present invention is provided with an electric section having a plurality of sliding portions that slide along the predetermined conductor pattern. The electric section is provided with a thin-sheet electric section body supporting the plurality of sliding portions, and a reinforcing portion is provided at |
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